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(#) Notifications Without Permission

!!! ERROR: Notifications Without Permission
   This is an error.

Id
:   `NotificationPermission`
Summary
:   Notifications Without Permission
Severity
:   Error
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   7.4.0 (January 2023)
Affects
:   Kotlin and Java files and library bytecode
Editing
:   This check runs on the fly in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/NotificationPermissionDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/NotificationPermissionDetectorTest.kt)

When targeting Android 13 and higher, posting permissions requires
holding the runtime permission `android.permission.POST_NOTIFICATIONS`.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
src/test/pkg/NotificationTestAndroidx.java:21:Error: When targeting
Android 13 or higher, posting a permission requires holding the
POST_NOTIFICATIONS permission [NotificationPermission]
    notificationManager.notify(id, notification);
    --------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`src/AndroidManifest.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="test.pkg.permissiontest"&gt;
    &lt;uses-sdk android:minSdkVersion="17" android:targetSdkVersion="33" /&gt;
    &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /&gt;
&lt;/manifest&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`src/test/pkg/NotificationTestAndroidx.java`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers
package test.pkg;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.Context;

import androidx.core.app.NotificationCompat;

public class NotificationTestAndroidx {
    public void testAndroidX(Context context, String channelId, int id, int requestCode, int flags) {
        NotificationCompat.Builder builder =
                new NotificationCompat.Builder(context, channelId)
                        .setSmallIcon(android.R.drawable.ic_menu_my_calendar)
                        .setContentTitle("Notification Trampoline Test")
                        .setContentText("Tap this notification to launch a new receiver")
                        .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                        .setAutoCancel(true);
        Notification notification = builder.build();
        NotificationManager notificationManager =
                context.getSystemService(NotificationManager.class);
        notificationManager.notify(id, notification);
    }
}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/NotificationPermissionDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a suppression annotation like this on the enclosing
  element:

  ```kt
  // Kotlin
  @Suppress("NotificationPermission")
  fun method() {
     notify(...)
  }
  ```

  or

  ```java
  // Java
  @SuppressWarnings("NotificationPermission")
  void method() {
     notify(...);
  }
  ```

* Using a suppression comment like this on the line above:

  ```kt
  //noinspection NotificationPermission
  problematicStatement()
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="NotificationPermission" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'NotificationPermission'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore NotificationPermission ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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